There are four types of granules that can be squeezed out of the nipple: First, the nipple and the surrounding skin are rich in sebaceous glands, which can appear as granular tofu-like material when squeezing the nipple when it is infected. Second, during puberty or physiology, the breasts secrete a small amount of clear, bright-colored fluid and accumulate in the nipple to precipitate precipitation, which can appear as white granular material when squeezing the nipple. Third, when suffering from cystic hyperplasia of the breast, squeezing the nipple can be seen as a small amount of yellowish granular material. Fourthly, if white granular tissue appears in the nipple during lactation, it may be milk crystals or purulent secretions, which are mostly combined with milk stagnation, and the granular stuff extruded from the nipple is a normal physiological phenomenon. If there is a combination of breast swelling and pain, you should go to the regular hospital breast surgery or general surgery in time to clarify the cause of the breast and actively treat it, which will not cause serious consequences.